CHAPTER 28
PAGE 5
MAINTENANCE MANUAL EXTRA 300/SC
PAGE DATE: 16. June 2008
Refueling/Defueling
Refer to Chapter 12 for detailed refueling/defueling proce-
dures.
Reduction of Fuel Tank Vapor Hazards
(General Precautions)
During all ventilation or maintenance procedures involving
the fuel system, observe the following general precautions.
1 Defueling should be outdoors with the aircraft at least 100
feet from hangars or other aircraft.
2 No smoking should be allowed within 100 feet of the air-
craft.
3 Suitable fire fighting equipment should be available. Foam
or soda type extinguishing agents are recommended.
4 Ground the aircraft to prevent static electricity from caus-
ing sparks. If a ramp ground is available it should be con-
nected to exhaust stack. If a ramp ground is not provided, a
temporary ground can be obtained by driving a metal rod
into the ground and attaching a ground wire between the rod
and the aircraft exhaust stack.
5 Flame and spark producing equipment should not be oper-
ated within 100 feet of the aircraft.
6 The aircraft should have its battery removed.
7 Only personnel working on the aircraft should be allowed
in the immediate area, and no other maintenance should be
performed while the tanks are being worked on.
8 When a fuel tank is opened for repair, air ventilation (refer
to Page 7) should be started immediately to reduce vapor
concentrations.
9 When draining fuel, ensure that suitable containers are avail-
able and that drained fuel is stored safely. Do not allow fuel
to drip to the ground and form pools.
10 If it is necessary to ventilate a tank when the aircraft is in
hangar, ensure that vapors do not accumulate to explosive
or toxic levels in the hangar.
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